If successful, the seventh seeds will become the first mixed pair since Michael Keck/Karen Stechmann in 1994 to retain their title.
It’s the longest category not to see the holders defend their crown.
Chou, Kusharjanto and Kusumawati are three of 17 former winners in the draw.
Ng Ka Long Angus, Toma Junior Popov, Kirsty Gilmour, He Ji Ting, Ong Yew Sin/Teo Ee Yi, Zhang Shu Xian, Gabriela Stoeva/Stefani Stoeva, Marcus Ellis/Lauren Smith, Selena Piek, Mathias Christiansen/Alexandra Boje are the others.
The Stoevas (2018, 2020) and Ellis (men’s doubles with Chris Langridge and mixed doubles with Smith in 2018) are multiple winners.
He, Zhang and Piek are back alongside new partners. Chen Qing Chen in 2016 was the most recent to come back and triumph with a different player (Jia Yi Fan). She had combined with Zheng Si Wei to the mixed doubles title two years earlier.
Piek, and former women’s doubles sidekick Eefje Muskens, are the last Dutch players to top the podium.